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Polycom, Inc. 147
See also:
“Add MCU Dialog Box” on page 137
“Edit MCU Dialog Box” on page 142
ISDN Gateway Selection Process
When the dial string begins with a simplified ISDN gateway dialing prefix, the
Polycom DMA system chooses an ISDN gateway by applying the following
steps:
1 Strip the ISDN gateway dialing prefix from the dial string, leaving the
E.164 number.
2 From the in-service (not busied out or out of service) gateways, select the
ones that have a profile with a matching or higher bit rate (higher bit rate
can only be used for RMX). If none, go to 3; otherwise, go to 4.
3 From the remaining gateways, select those with a profile bit rate lower
than the requested bit rate. If none, reject the call.
4 From the remaining gateways, select those that match the country code
and area code of the dialed number. If none, go to 5; otherwise, go to 6.
5 From the remaining gateways, select those that match the country code of
the dialed number, if any.
6 From the remaining gateways, select those with a profile that has the
closest bit rate. An exact match is preferred.
7 From the remaining gateways, select those that are in the same site as the
calling endpoint, if any.
8 From the remaining gateways, select one using a round-robin method.
9 If the call fails because of no capacity on the selected gateway, select the
next gateway left in 8. If none, start again at 2 (omitting the gateway that
failed). If none left, reject the call.
Table 6-6 Edit Session Profile dialog box
Field Description
Session profile Numeric dial string prefix for this profile.
Bit rate Bit rate of calls using this profile.
H.320
PSTN
H.323
SIP
Select the protocol(s) for this profile.
Only H.320 and PSTN are relevant when editing a
profile you added. The other two are selected if the
gateway specified them when registering.